i just got one too, and it was for honolulu credit union. i don't even have an account. i emailed the bank to let them know some idiots are doing this.
DON'T BITE. Don't call back. Turn your debit card over and call the customer service number on the other side, and ask them about it, or if you have time go to the bank and ask them. I can guarantee you about 99% that this is a scam and somebody is trying to get your personal information so they can clean out your account.